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Author : Krishan K. Ahuja
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (588 download)
Download or read book Blown Flap Noise Test written by Krishan K. Ahuja and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : A. P. Pennock
Publisher :
ISBN 13 :
Total Pages : 336 pages
Book Rating : 4.:/5 (317 download)
Download or read book Static and Wind Tunnel Model Tests for the Development of Externally Blown Flap Noise Reduction Techniques written by A. P. Pennock and published by . This book was released on 1975 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Allen M. Karchmer
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (12 download)
Download or read book Noise Tests on an Externally Blown Flap with the Engine in Front of the Wing written by Allen M. Karchmer and published by . This book was released on 1973 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (317 download)
Download or read book Externally-blown-flap Noise written by and published by . This book was released on 1972 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.:/5 (317 download)
Download or read book Mixer Nozzle-externally Blown Flap Noise Tests written by and published by . This book was released on 1972 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Martin Haas (S.M.)
Publisher :
ISBN 13 :
Total Pages : 91 pages
Book Rating : 4.:/5 (134 download)
Download or read book Blown Flap Noise written by Martin Haas (S.M.) and published by . This book was released on 1972 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is concerned with the noise generated by blown flaps of the type currently being developed for the short take off and landing aircraft. The majority of the report is an experimental study of the sound-radiation produced by a small scale externally blown double-slotted flap model. Tests were carried out with and without a forward velocity of 60 MPH for a basic engine-wing configuration and for a modified (Engine moved inboard) configuration. Noise radiation patterns and sound pressure level spectra were obtained for nozzle exhaust velocities between 100 and 500 ft/sec. In addition all model data was extrapolated to five fictional full scale STOL aircrafts. The noise generated by the impingement of the jet on the externally blown flap is highly dependent on the jet velocity and the flap position. As the flap angle is increased the noise generated increases. At the 45* - 70* flap position the noise is more than 25db over that caused by the model jet alone. It is especially louder below the wing. The sound power level generated by the externally blown flap (at all positions) increased with the sixth power of the jet's blowing velocity. As the nozzle jet velocity is increased, the sound power level of the noise from the nozzle alone generally increased with the expected eighth power of the jet velocity. Therefore, the difference between the impingement noise and the noise of the nozzle alone decreased with increasing velocity. The noise radiation pattern becomes more directed below the wing as the flaps are lowered. The effect of forward velocity on the noise generated was neglible for a ratio of jet to forward velocity greater than 4.5. Results on tests made on the modified engine-wing configurations were similar to that of the basic configuration except for a slight reduction in overall sound pressure level (2 to 4 db) over all positions measured. An extrapolation to full scale indicated that the externally blown flap noise must be suppressed to meet STOL aircraft noise goals.
Author : Jack H. Goodykoontz
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.:/5 (31 download)
Download or read book Noise Tests of a Mixer Nozzle-externally Blown Flap System written by Jack H. Goodykoontz and published by . This book was released on 1973 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Noise tests were conducted on a large scale model of an externally blown flap lift augmentation system, employing a mixer nozzle. The mixer nozzle consisted of seven flow passages with a total equivalent diameter of 40 centimeters. With the flaps in the 30 - 60 deg setting, the noise level below the wing was less with the mixer nozzle than when a standard circular nozzle was used. At the 10 - 20 deg flap setting, the noise levels were about the same when either nozzle was used. With retracted flaps, the noise level was higher when the mixer nozzle was used.
Author :
Publisher :
ISBN 13 :
Total Pages : 102 pages
Book Rating : 4.:/5 (317 download)
Download or read book Blown Flap Noise Prediction written by and published by . This book was released on 1978 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Daniel J. McKinzie
Publisher :
ISBN 13 :
Total Pages : 70 pages
Book Rating : 4.:/5 (31 download)
Download or read book Noise Reduction Tests of Large Scale Model Externally Blown Flap Using Trailing-edge Blowing and Partial Flap Slot Covering written by Daniel J. McKinzie and published by . This book was released on 1976 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : William A. Olsen
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.:/5 (31 download)
Download or read book Noise Produced by a Small-scale, Externally Blown Flap written by William A. Olsen and published by . This book was released on 1972 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Noise data were obtained with a model of an externally blown flap of the type that is currently being considered for STOL aircraft. The noise caused by impingement of the jet on the flap is much louder than the nozzle jet noise. It is especially so directly below the wing. The noise level increases as the jet velocity and flap angle are increased. The sound power level increased with the sixth power of velocity. Several physical variations to the STOL model configuration were also tested. Two such variations, a large board and a slotless curved plate wing, had the same power spectra density (Strouhal number curve) as the model.
Author :
Publisher :
ISBN 13 :
Total Pages : 178 pages
Book Rating : 4.:/5 (317 download)
Download or read book Additional Studies of Externally Blown Flap Noise written by and published by . This book was released on 1976 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.:/5 (317 download)
Download or read book Prediction of Externally Blown Flap Noise and Turbomachinery Strut Noise written by and published by . This book was released on 1975 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Martin R. Fink
Publisher :
ISBN 13 :
Total Pages : 138 pages
Book Rating : 4.F/5 ( download)
Download or read book A Method for Calculating Externally Blown Flap Noise written by Martin R. Fink and published by . This book was released on 1978 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Martin Haas
Publisher :
ISBN 13 :
Total Pages : 206 pages
Book Rating : 4.:/5 (291 download)
Download or read book Blown Flap Noise written by Martin Haas and published by . This book was released on 1972 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 628 pages
Book Rating : 4.:/5 (319 download)
Download or read book NASA Reference Publication written by and published by . This book was released on 1977 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Harvey H. Hubbard
Publisher :
ISBN 13 :
Total Pages : 620 pages
Book Rating : 4.F/5 ( download)
Download or read book Aeroacoustics of Flight Vehicles written by Harvey H. Hubbard and published by . This book was released on 1991 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 158 pages
Book Rating : 4.:/5 (317 download)
Download or read book Small Scale Noise and Wind Tunnel Tests of Upper Surface Blowing Nozzle Flap Concepts. Volume 1. Aerodynamic Test Results written by and published by . This book was released on 1975 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
